Extracellular Vesicles

IL-10, the cytokine that calms inflammation, never quite became a drug: it is unstable and clears from the body fast. A Michigan State University team harvested extracellular vesicles from cells made to overexpress IL-10 with minicircle DNA, and shows they are more stable than recombinant IL-10 and quiet inflammatory macrophages. But naïve vesicles, with no IL-10 gene introduced, worked too. Every experiment is in cultured cells.

As obesity drags on, pancreatic beta cells multiply and work harder to hold off diabetes (beta cell compensation). A team at China Pharmaceutical University shows that in this emergency, beta cells release extracellular vesicles (sEV) loaded with miR-151 and turn nearby mesenchymal stem cells (MSC) into helpers. Freed from the KLF9 brake, the MSCs proliferate and secrete WNT to support beta cells. Dr. Exotaro unpacks this cell-and-mouse preclinical study.

Diabetic wounds pit impaired angiogenesis against chronic inflammation. A team engineered bFGF-loaded, RGD-targeted M2 exosomes, delivered deep by a dissolving microneedle, to speed healing in diabetic mice.

MSC-derived extracellular vesicles are biocompatible, low-immunogenicity 'natural nanocapsules.' This review maps six strategies to engineer them into drug carriers and their clinical safety data.

The brain barely regenerates after injury. Using single-cell analysis, this work reveals how the gene L-Myc and extracellular vesicles (EVs) drive the diversity of neural stem cells.